added CRI ADX and XA ADPCM audio modules, courtesy of BERO

<bero -at- geocities.co.jp>

Originally committed as revision 2376 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/adx.c

+/*
+ * ADX ADPCM codecs
+ * Copyright (c) 2001,2003 BERO
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avcodec.h"
+
+/**
+ * @file adx.c
+ * SEGA CRI adx codecs.
+ *
+ * Reference documents:
+ * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
+ * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
+ */
+
+typedef struct {
+	int s1,s2;
+} PREV;
+
+typedef struct {
+	PREV prev[2];
+	int header_parsed;
+	unsigned char dec_temp[18*2];
+	unsigned short enc_temp[32*2];
+	int in_temp;
+} ADXContext;
+
+//#define	BASEVOL	0x11e0
+#define	BASEVOL	0x4000
+#define SCALE1	0x7298
+#define	SCALE2	0x3350
+
+#define	CLIP(s)	if (s>32767) s=32767; else if (s<-32768) s=-32768
+
+/* 18byte <-> 32 samples */
+
+#ifdef CONFIG_ENCODERS
+static void adx_encode(unsigned char *adx,const short *wav,PREV *prev)
+{
+	int scale;
+	int i;
+	int s0,s1,s2,d;
+	int max=0;
+	int min=0;
+	int data[32];
+
+	s1 = prev->s1;
+	s2 = prev->s2;
+	for(i=0;i<32;i++) {
+		s0 = wav[i];
+		d = ((s0<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL;
+		data[i]=d;
+		if (max<d) max=d;
+		if (min>d) min=d;
+		s2 = s1;
+		s1 = s0;
+	}
+	prev->s1 = s1;
+	prev->s2 = s2;
+
+	/* -8..+7 */
+
+	if (max==0 && min==0) {
+		memset(adx,0,18);
+		return;
+	}
+
+	if (max/7>-min/8) scale = max/7;
+	else scale = -min/8;
+
+	if (scale==0) scale=1;
+
+	adx[0] = scale>>8;
+	adx[1] = scale;
+
+	for(i=0;i<16;i++) {
+		adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf);
+	}
+}
+#endif //CONFIG_ENCODERS
+
+static void adx_decode(short *out,const unsigned char *in,PREV *prev)
+{
+	int scale = ((in[0]<<8)|(in[1]));
+	int i;
+	int s0,s1,s2,d;
+
+//	printf("%x ",scale);
+
+	in+=2;
+	s1 = prev->s1;
+	s2 = prev->s2;
+	for(i=0;i<16;i++) {
+		d = in[i];
+		// d>>=4; if (d&8) d-=16;
+		d = ((signed char)d >> 4);
+		s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
+		CLIP(s0);
+		*out++=s0;
+		s2 = s1;
+		s1 = s0;
+
+		d = in[i];
+		//d&=15; if (d&8) d-=16;
+		d = ((signed char)(d<<4) >> 4);
+		s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
+		CLIP(s0);
+		*out++=s0;
+		s2 = s1;
+		s1 = s0;
+	}
+	prev->s1 = s1;
+	prev->s2 = s2;
+
+}
+
+static void adx_decode_stereo(short *out,const unsigned char *in,PREV *prev)
+{
+	short tmp[32*2];
+	int i;
+
+	adx_decode(tmp   ,in   ,prev);
+	adx_decode(tmp+32,in+18,prev+1);
+	for(i=0;i<32;i++) {
+		out[i*2]   = tmp[i];
+		out[i*2+1] = tmp[i+32];
+	}
+}
+
+#ifdef CONFIG_ENCODERS
+
+static void write_long(unsigned char *p,uint32_t v)
+{
+	p[0] = v>>24;
+	p[1] = v>>16;
+	p[2] = v>>8;
+	p[3] = v;
+}
+
+static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize)
+{
+#if 0
+	struct {
+		uint32_t offset; /* 0x80000000 + sample start - 4 */
+		unsigned char unknown1[3]; /* 03 12 04 */
+		unsigned char channel; /* 1 or 2 */
+		uint32_t freq;
+		uint32_t size;
+		uint32_t unknown2; /* 01 f4 03 00 */
+		uint32_t unknown3; /* 00 00 00 00 */
+		uint32_t unknown4; /* 00 00 00 00 */
+
+	/* if loop
+		unknown3 00 15 00 01
+		unknown4 00 00 00 01
+		long loop_start_sample;
+		long loop_start_byte;
+		long loop_end_sample;
+		long loop_end_byte;
+		long 
+	*/
+	} adxhdr; /* big endian */
+	/* offset-6 "(c)CRI" */
+#endif
+	write_long(buf+0x00,0x80000000|0x20);
+	write_long(buf+0x04,0x03120400|avctx->channels);
+	write_long(buf+0x08,avctx->sample_rate);
+	write_long(buf+0x0c,0); /* FIXME: set after */
+	write_long(buf+0x10,0x01040300);
+	write_long(buf+0x14,0x00000000);
+	write_long(buf+0x18,0x00000000);
+	memcpy(buf+0x1c,"\0\0(c)CRI",8);
+	return 0x20+4;
+}
+
+static int adx_decode_init(AVCodecContext *avctx);
+static int adx_encode_init(AVCodecContext *avctx)
+{
+    if (avctx->channels > 2)
+        return -1; /* only stereo or mono =) */
+    avctx->frame_size = 32;
+
+    avctx->coded_frame= avcodec_alloc_frame();
+    avctx->coded_frame->key_frame= 1;
+
+//    avctx->bit_rate = avctx->sample_rate*avctx->channels*18*8/32;
+
+    printf("adx encode init\n"); fflush(stdout);
+    adx_decode_init(avctx);
+
+    return 0;
+}
+
+static int adx_encode_close(AVCodecContext *avctx)
+{
+    av_freep(&avctx->coded_frame);
+
+    return 0;
+}
+
+static int adx_encode_frame(AVCodecContext *avctx,
+			    unsigned char *frame, int buf_size, const void *data)
+{
+	ADXContext *c = avctx->priv_data;
+	const short *samples = data;
+	unsigned char *dst = frame;
+	int rest = avctx->frame_size;
+
+/*
+	input data size =
+	ffmpeg.c: do_audio_out()
+	frame_bytes = enc->frame_size * 2 * enc->channels;
+*/
+
+//	printf("sz=%d ",buf_size); fflush(stdout);
+	if (!c->header_parsed) {
+		int hdrsize = adx_encode_header(avctx,dst,buf_size);
+		dst+=hdrsize;
+		c->header_parsed = 1;
+	}
+
+	if (avctx->channels==1) {
+		while(rest>=32) {
+			adx_encode(dst,samples,c->prev);
+			dst+=18;
+			samples+=32;
+			rest-=32;
+		}
+	} else {
+		while(rest>=32*2) {
+			short tmpbuf[32*2];
+			int i;
+
+			for(i=0;i<32;i++) {
+				tmpbuf[i] = samples[i*2];
+				tmpbuf[i+32] = samples[i*2+1];
+			}
+
+			adx_encode(dst,tmpbuf,c->prev);
+			adx_encode(dst+18,tmpbuf+32,c->prev+1);
+			dst+=18*2;
+			samples+=32*2;
+			rest-=32*2;
+		}
+	}
+	return dst-frame;
+}
+
+#endif //CONFIG_ENCODERS
+
+static uint32_t read_long(const unsigned char *p)
+{
+	return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3];
+}
+
+int is_adx(const unsigned char *buf,size_t bufsize)
+{
+	int	offset;
+
+	if (buf[0]!=0x80) return 0;
+	offset = (read_long(buf)^0x80000000)+4;
+	if (bufsize<offset || memcmp(buf+offset-6,"(c)CRI",6)) return 0;
+	return offset;
+}
+
+/* return data offset or 6 */
+static int adx_decode_header(AVCodecContext *avctx,const unsigned char *buf,size_t bufsize)
+{
+	int offset;
+	int channels,freq,size;
+
+	offset = is_adx(buf,bufsize);
+	if (offset==0) return 0;
+
+	channels = buf[7];
+	freq = read_long(buf+8);
+	size = read_long(buf+12);
+
+//	printf("freq=%d ch=%d\n",freq,channels);
+
+	avctx->sample_rate = freq;
+	avctx->channels = channels;
+	avctx->bit_rate = freq*channels*18*8/32;
+//	avctx->frame_size = 18*channels;
+
+	return offset;
+}
+
+static int adx_decode_init(AVCodecContext * avctx)
+{
+	ADXContext *c = avctx->priv_data;
+
+//	printf("adx_decode_init\n"); fflush(stdout);
+	c->prev[0].s1 = 0;
+	c->prev[0].s2 = 0;
+	c->prev[1].s1 = 0;
+	c->prev[1].s2 = 0;
+	c->header_parsed = 0;
+	c->in_temp = 0;
+	return 0;
+}
+
+static void dump(unsigned char *buf,size_t len)
+{
+	int i;
+	for(i=0;i<len;i++) {
+		if ((i&15)==0) printf("%04x  ",i);
+		printf("%02x ",buf[i]);
+		if ((i&15)==15) printf("\n");
+	}
+	printf("\n");
+}
+static int adx_decode_frame(AVCodecContext *avctx,
+			    void *data, int *data_size,
+			    const uint8_t *buf0, int buf_size)
+{
+	ADXContext *c = avctx->priv_data;
+	short *samples = data;
+	const uint8_t *buf = buf0;
+	int rest = buf_size;
+
+	if (!c->header_parsed) {
+		int hdrsize = adx_decode_header(avctx,buf,rest);
+		if (hdrsize==0) return -1;
+		c->header_parsed = 1;
+		buf  += hdrsize;
+		rest -= hdrsize;
+	}
+
+	if (c->in_temp) {
+		int copysize = 18*avctx->channels - c->in_temp;
+		memcpy(c->dec_temp+c->in_temp,buf,copysize);
+		rest -= copysize;
+		buf  += copysize;
+		if (avctx->channels==1) {
+			adx_decode(samples,c->dec_temp,c->prev);
+			samples += 32;
+		} else {
+			adx_decode_stereo(samples,c->dec_temp,c->prev);
+			samples += 32*2;
+		}
+	}
+	//
+	if (avctx->channels==1) {
+		while(rest>=18) {
+			adx_decode(samples,buf,c->prev);
+			rest-=18;
+			buf+=18;
+			samples+=32;
+		}
+	} else {
+		while(rest>=18*2) {
+			adx_decode_stereo(samples,buf,c->prev);
+			rest-=18*2;
+			buf+=18*2;
+			samples+=32*2;
+		}
+	}
+	//
+	c->in_temp = rest;
+	if (rest) {
+		memcpy(c->dec_temp,buf,rest);
+		buf+=rest;
+	}
+	*data_size = (uint8_t*)samples - (uint8_t*)data;
+//	printf("%d:%d ",buf-buf0,*data_size); fflush(stdout);
+	return buf-buf0;
+}
+
+#define DEFINE_ENCODER(id, name, context)                \
+AVCodec name ## _encoder = {                    \
+    #name,                                      \
+    CODEC_TYPE_AUDIO,                           \
+    id,                                         \
+    sizeof(context),                       \
+    name ## _encode_init,                       \
+    name ## _encode_frame,                      \
+    name ## _encode_close,                      \
+    NULL,                                       \
+};
+
+#define DEFINE_DECODER(id, name, context)                \
+AVCodec name ## _decoder = {                    \
+    #name,                                      \
+    CODEC_TYPE_AUDIO,                           \
+    id,                                         \
+    sizeof(context),                       \
+    name ## _decode_init,                       \
+    NULL,                                       \
+    NULL,                                       \
+    name ## _decode_frame,                      \
+};
+
+#ifdef CONFIG_ENCODERS
+DEFINE_ENCODER(CODEC_ID_ADPCM_ADX,adx,ADXContext)
+#endif //CONFIG_ENCODERS
+
+DEFINE_DECODER(CODEC_ID_ADPCM_ADX,adx,ADXContext)

libavcodec/xa.c

+/*
+ * CD-ROM XA ADPCM codecs
+ * Copyright (c) 1999,2003 BERO
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avcodec.h"
+
+/**
+ * @file xa.c
+ * CD-ROM XA ADPCM codecs.
+ *
+ * Reference documents:
+ * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html
+ * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html
+ * readstr http://www.geocities.co.jp/Playtown/2004/
+ */
+
+typedef struct {
+	int s1,s2;
+} PREV;
+
+typedef struct {
+	PREV prev[2];
+} XAContext;
+
+#define	CLIP(s)		if (s<-32768) s=-32768; else if (s>32767) s=32767
+
+static void xa_decode(short *out,const unsigned char *in,PREV *prev,int inc)
+{
+	const static int f[5][2] = {
+		{0,0},
+		{60,0},
+		{115,-52},
+		{98,-55},
+		{122,-60}
+	};
+
+	int i,j;
+
+  for(i=0;i<4;i++) {
+	int shift,filter,f0,f1;
+	int s_1,s_2;
+
+	shift  = 12 - (in[4+i*2] & 15);
+	filter = in[4+i*2] >> 4;
+	f0 = f[filter][0];
+	f1 = f[filter][1];
+
+	s_1 = prev->s1;
+	s_2 = prev->s2;
+
+	for(j=0;j<28;j++) {
+		int d,s,t;
+		d = in[16+i+j*4];
+
+		//t = d&0xf;
+		//if (t>=8) t-=16;
+		t = (signed char)(d<<4)>>4;
+		s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
+		CLIP(s);
+		*out = s;
+		out += inc;
+		s_2 = s_1;
+		s_1 = s;
+	}
+
+	if (inc==2) { /* stereo */
+		prev->s1 = s_1;
+		prev->s2 = s_2;
+		s_1 = prev[1].s1;
+		s_2 = prev[1].s2;
+		out = out + 1 - 28*2;
+	}
+
+	shift  = 12 - (in[5+i*2] & 15);
+	filter = in[5+i*2] >> 4;
+	f0 = f[filter][0];
+	f1 = f[filter][1];
+
+	for(j=0;j<28;j++) {
+		int d,s,t;
+		d = in[16+i+j*4];
+
+		//t = d>>4;
+		//if (t>=8) t-=16;
+		t = (signed char)d >> 4;
+		s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
+		CLIP(s);
+		*out = s;
+		out += inc;
+		s_2 = s_1;
+		s_1 = s;
+	}
+
+	if (inc==2) { /* stereo */
+		prev[1].s1 = s_1;
+		prev[1].s2 = s_2;
+		out -= 1;
+	} else {
+		prev[0].s1 = s_1;
+		prev[0].s2 = s_2;
+	}
+
+  }
+
+}
+
+static int xa_decode_init(AVCodecContext * avctx)
+{
+	XAContext *c = avctx->priv_data;
+
+	printf("xa init %d\n",avctx->channels);
+
+	c->prev[0].s1 = 0;
+	c->prev[0].s2 = 0;
+	c->prev[1].s1 = 0;
+	c->prev[1].s2 = 0;
+	switch(avctx->channels) {
+	case 1:
+	case 2:
+		return 0;
+	default:
+		return -1;
+	}
+}
+
+static int xa_decode_frame(AVCodecContext *avctx,
+			    void *data, int *data_size,
+			    const uint8_t *buf0, int buf_size)
+{
+	XAContext *c = avctx->priv_data;
+	short *samples = data;
+	const uint8_t *buf = buf0;
+
+//	printf("xa decode %d\n",buf_size);
+
+	c->prev[0].s1 = 0;
+	c->prev[0].s2 = 0;
+	c->prev[1].s1 = 0;
+	c->prev[1].s2 = 0;
+
+	while(buf_size>=128) {
+		xa_decode(samples,buf,c->prev,avctx->channels);
+		buf+=128;
+		samples += 28*8;
+		buf_size-=128;
+	}
+	*data_size = (char*)samples - (char*)data;
+	return buf-buf0;
+}
+
+#define DEFINE_ENCODER(id, name,context)                \
+AVCodec name ## _encoder = {                    \
+    #name,                                      \
+    CODEC_TYPE_AUDIO,                           \
+    id,                                         \
+    sizeof(context),                       \
+    name ## _encode_init,                       \
+    name ## _encode_frame,                      \
+    name ## _encode_close,                      \
+    NULL,                                       \
+};
+
+#define DEFINE_DECODER(id, name,context)                \
+AVCodec name ## _decoder = {                    \
+    #name,                                      \
+    CODEC_TYPE_AUDIO,                           \
+    id,                                         \
+    sizeof(context),                       \
+    name ## _decode_init,                       \
+    NULL,                                       \
+    NULL,                                       \
+    name ## _decode_frame,                      \
+};
+
+DEFINE_DECODER(CODEC_ID_ADPCM_XA,xa,XAContext)